There isn't any way to enforce this site-wide in Mailman, so far as I know. So even if it was agreed that the setting should be uniform, we'd have to patch Mailman to remove the ability of list owners to change the setting.

Personally, I think it's best that each list owner can choose the setting that matches their particular membership. Folks coming from the kernel or git communities, for example, would be quite used to using reply all to send replies to both the list and to previous posters to the thread. Mucking with the reply-to there might even be considered rude.

If it was entirely my call, I'd close this as wontfix for the reasons listed above.

Replying to [comment:2 tmz]:

Personally, I think it's best that each list owner can choose the setting that matches their particular membership. Folks coming from the kernel or git communities, for example, would be quite used to using reply all to send replies to both the list and to previous posters to the thread. Mucking with the reply-to there might even be considered rude.

Just wondering, what is the default for new mailing lists? Did the devel list owners or the arm list owners change the setting?

Replying to [comment:3 till]:

Just wondering, what is the default for new mailing lists? Did the devel list owners or the arm list owners change the setting?

Good question. I thought it was set to reply to the list, but looking at the Mailman
settings it appears to be not to touch the reply-to header at all.

The relevant Mailman defaults for this are described in
~mailman/Mailman/Defaults.py:

{{{

Mailman can be configured to "munge" Reply-To: headers for any passing

messages. One the one hand, there are a lot of good reasons not to munge

Reply-To: but on the other, people really seem to want this feature. See

the help for reply_goes_to_list in the web UI for links discussing the

issue.

0 - Reply-To: not munged

1 - Reply-To: set back to the list

2 - Reply-To: set to an explicit value (reply_to_address)

DEFAULT_REPLY_GOES_TO_LIST = 0
}}}

This setting is the sort of thing that holy wars are made of. Either way you set it, many people are not happy. :)

We've had a pretty long discussion about this off list (it went to several mail owners) and I think the general consensus was that this should be a per list option (as it is today) but that we shouldn't globally make the behaviour any different.